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Usually an external ground connection may be required if there is an audio hum present after hooking up the turntable to the amplifier.If no hum is present,then the ground cable may not be required to be connected.Also check the audio quality on play back.The ground circuit is normally completed through the RCA plugs of the right and left channels.

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If your turn table has a ground wire with the R and L wires then you can not connect it to this receiver. Unless you have a switch on the turn table that chooses between internal or external amp. If you have the switch, pick external amp and then run your R and L into your TV/CD input. Good luck to you.

you can do it a couple of different ways, depending on what you're trying to do with your set-up.if you're trying to do something different than what I describe here, add a comment. for independent volume control (each unit contols volume to a set of speakers independent of each other) use the rca 'tape' out of the jvc into the rca inputs on the back of the gemini.this puts a stereo signal from the jvc to the gemini. if you want your gemini to power your subs, get an rca y-splitter (single female to double male) and a single rca cable, hook single rca cable to sub out of jvc, connect y-splitter to gemini rca inputs, and single rca to y-splitter.

There are several possible solutions for this. The cheapest and easiest is to do the following:Solution 1:1. Get an RCA stereo plug to 3.5 mm plug. This will go from your mixer to your computer. This will not be the highest quality, but will work.2. Get an XLR cable of the length you need. I would guess a standard one with a male connection on one end and a female on the other. Connect this to your powered speaker. Also, this is a guess as you didn't include the type of powered speaker, so I can't tell you for sure which cable to use.Solution 2:1. An alternate idea for better sound quality would be to run a D/A converter similar to this one: http://www.sweetwater.com/store/detail/USBMix/It would give you a much higher sound quality for everything. You would run from your Gemini to this. From this device, you would run a USB cable to your computer, and a 1/4" cable to your powered speaker.

In general, your PC's sound card (and its controlling software) will determine what it can connect to.Even the most basic PC would have stereo analog output via the typical green 1/8" connector or a headphone jack that easily adapts to RCA pair for REAL audio connection. Any Line Level input EXCEPT PHONO would accept the PC's output. The output level would be controlled by the sound card software and settings.The Gemini's Input would accept the Green stereo audio or speaker output from a standard PC, once adapted. Select Line In. http://i.ehow.co.uk/images/a04/fa/r2/subwoofers-as-home-entertainment-set-1.1-800X800.jpgThe Gemini's Output (Record Master) would perform similarly if adapted to your PC's audio input, whatever that may turn out to be (usually Mic, maybe Line In).Find your PC's Sound Controls and enable the applicable input. make sure the volumes of both Inputs and Outputs are turned up.Though not applicable to theGemini, more-advanced sound cards and audio hardware would have similar adaptable 5.1 or 7.1 (paired) analog outputs and / or digital audio outputs that conform to the s/pdif or Dolby Digital standards.

I had the same problem except it was with a miller welder. it was a bad ground connection on the ground cable. if you have an ohm meter. turn off your machine,but do not unplug it. check for resistance from chassis ground on machine to input ground if your input on the machine is good you may have a bad cable,input connection or the ground clamp may not be making a good connection to the cable. good luck!

If you are comparing the isignal using the same input, the problem is in the cartridge, it may have loose the ground connection or the cartridges are differents and each cartridge may have different output.
if you are using different inputs, one of them (the lowest) may be connected to the line input instead of the phono input.